EP3121369A1 - Kabelbolzen - Google Patents

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Publication number
EP3121369A1
EP3121369A1 EP15177973.3A EP15177973A EP3121369A1 EP 3121369 A1 EP3121369 A1 EP 3121369A1 EP 15177973 A EP15177973 A EP 15177973A EP 3121369 A1 EP3121369 A1 EP 3121369A1
Authority
EP
European Patent Office
Prior art keywords
weight percent
cable
strand cable
steel
strand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15177973.3A
Other languages
English (en)
French (fr)
Inventor
Christophe Mesplont
Alejandro SUAZO LUENGO
Steven DERYCKE
Hector Paredes Montecinos
Erik Dekempeneer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bekaert NV SA filed Critical Bekaert NV SA
Priority to EP15177973.3A priority Critical patent/EP3121369A1/de
Priority to EP16739129.1A priority patent/EP3325769A1/de
Priority to CA2989263A priority patent/CA2989263A1/en
Priority to CN201680041823.6A priority patent/CN107849918A/zh
Priority to PE2017002726A priority patent/PE20180638A1/es
Priority to PCT/EP2016/066817 priority patent/WO2017012994A1/en
Priority to AU2016294836A priority patent/AU2016294836A1/en
Priority to US15/744,392 priority patent/US20180245468A1/en
Publication of EP3121369A1 publication Critical patent/EP3121369A1/de
Priority to CL2017003380A priority patent/CL2017003380A1/es
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0006—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by the bolt material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/22—Martempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/006—Anchoring-bolts made of cables or wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the invention relates to cable bolts, in particular to cable bolts used for burst prone areas in mining operations and its production method.
  • Cable bolts help to maintain a continuum nature within the rock mass, thereby improving overall stability. In addition, by supporting blocks of rock at the excavation surface, the remaining rock mass is prevented from loosening and weakening. Cable bolts thus restrict the dangerous and costly effects of progressive instability and failure.
  • a cable bolt for providing support and balance to a rock mass comprising:
  • the cable bolt according to the present invention may further comprise a plate for placement between the rock mass and said fixture for tensioning said multi-strand cable relative to the rock mass, said plate defining a plate opening for the passage of said multi-strand cable through said plate.
  • the fixture of the cable bolt can be used for tensioning said multi-strand cable relative to the rock mass.
  • the fixture may comprise a wedge portion and a corresponding head portion, wherein said wedge portion engages said multi-strand cable and secures said multi-strand cable within said head portion as said wedge portion engages said corresponding head portion for tensioning said multi-strand cable.
  • the multi-strand cable of the cable bolt may be partially covered with a sleeve.
  • the sleeve may be in a form of tube and cladded on at least one portion of the multi-strand cable.
  • the sleeve may be made from metal material and preferably the same material of the cable. Alternatively, polymers or plastic materials, e.g. polypropylene sheath can be applied.
  • the portion of multi-strand cable covered by the sleeve is intended to be free to deform since it is not bound by the grout. Therefore, the multi-strand cable can present high elongation or energy dissipation at fracture.
  • the cable bolt is a multi-strand cable bolt and the multi-strand cable comprises a plurality of steel wires being twisted together.
  • at least one of the steel wires has a corrosion resistant coating, e.g. zinc or zinc alloy. More preferably, all the steel wires have the corrosion resistant coating.
  • the corrosion resistant coating on each of the steel wires secures a longer life time of the multi-strand cable bolts particularly in corrosive environments e.g. in coal mines.
  • At least one of the steel wires has surface deformations, e.g. indentations formed by rolling.
  • all the steel wires at the outer surface of the multi-strand cable have surface deformations. The desired deformations can increase the penetration of grout to the cable bolt and thus enhance the anchorage of the cable bolt to the rock mass.
  • the cable bolt or in the other word the multi-strand cable of the cable bolt according to the present invention may have a preselected length of less than 6 m. However, thanks to its flexibility, the cable bolt can have a preselected length of more than 6 m, e.g. more than 8 m.
  • the maximum possible preselected length of cable bolts is larger than other underground support means like D-bolts and rebars. This means cable bolts can reach deeper into the rock mass and reinforce larger volumes of rock.
  • the multi-strand cable may be in the form of seven steel wire having a central steel wire and six outer steel wires.
  • the diameter of the central steel wire may be larger than the diameter of the outer steel wires.
  • the multi-strand cable is in the form of six steel wires having a central steel wire and five outer steel wires. Thanks to the multi-strand cable construction, compared with D-bolts and rebars, the cable bolts having a similar diameter are lighter and more flexible.
  • both the deformation at fracture and the tensile strength are important properties. More importantly, the energy absorption ability of the bolts presents the bolt performance in dynamic environment.
  • the capacity of energy absorption of a rock bolt can be estimated from an engineering stress-strain curve.
  • An engineering stress-strain curve is typically constructed from the load deformation measurements. In the test a specimen is subjected to a continually increasing uniaxial tensile force while simultaneous observations are made of the deformation of the specimen. Deformation is the change in axial length divided by the original length of the specimen.
  • a typical stress-stain curve of a metal is illustrated in Fig. 1 .
  • the relationship between the stress ( ⁇ ) and strain ( ⁇ ) that a particular material displays is known as that particular material's stress-strain curve.
  • the energy absorption also called energy dissipation
  • the break or fracture point as indicated by point F in the curve of Fig. 1 ) where the test specimen is fractured.
  • the cable bolts according to the present invention have good energy absorption, which is not a character of conventional cable bolts.
  • the cable bolt of the present invention may have a deformation at fracture of at least 7 cm/m, preferably at least 10 cm/m, and more preferably at least 15 cm/m.
  • the diameter of the multi-strand cable is in the range of 10 to 40 mm, preferably in the range of 10 to 20 mm, e.g. about 15.4 mm and about 17.8 mm. Since the multi-strand cable is made by several wires, the diameter of multi-strand cable may deviate much from standard design. For instance, herein a multi-strand cable having a diameter of about 15.4 mm may include a multi-strand cable in practice in the range of 14.4 mm to 16.4 mm.
  • the cable bolt of the present invention preferably have energy absorption of at least 20 KJ/m, and more preferably at least 25KJ/m, for a cable bolt having a diameter of about 15.4 mm.
  • the cable bolt of the present invention preferably have energy absorption of at least 30 KJ/m, and more preferably at least 35 KJ/m, for a cable bolt having a diameter of about 17.8 mm.
  • the high energy absorption of the cable bolts according to the present invention makes it possible to elongate or deform with the movement of the rock mass and absorb high energy impact.
  • Such cable bolts are suitable for areas prone to rock burst in mines.
  • a multi-strand cable having a plurality of steel wires being twisted together, the diameter of said multi-strand cable being in the range of 10 to 40 mm, wherein at least one of the plurality of steel wires is made from steel having as steel composition:
  • the partitioned steel wire is cooled down to room temperature.
  • the cooling can be done in a water bath. This cooling down causes a secondary untempered martensite, next to the retained austenite and the primary tempered martensite.
  • the austenitizing step occurs at temperatures ranging from 920°C to 980°C, and preferably between 930°C and 970°C.
  • the partitioning step d) occurs at relatively high temperatures ranging from 400°C to 500 °C, more preferably from 420 °C to 460 °C. The inventor has experienced that these temperature ranges are favourable for the stability of the retained austenite in the final steel wire.
  • the diameter of the multi-strand cable is in the range of 10 to 40 mm and the preselected length of said multi-strand cable is at least 6 m.
  • the multi-strand cable may be in the form of seven steel wire having a central steel wire and six outer steel wires.
  • a cable bolt according to the present invention comprises a multi-strand cable.
  • the multi-strand cable is made by twisting at least two steel wires.
  • the steel wire has as a steel composition: a carbon content of 0.55 weight percent, a silicon content of 1.2 weight percent, a manganese content of 0.7 weight percent, a chromium content of 0.6 weight percent and the remainder being iron.
  • the starting temperature of martensite transformation Ms of this steel is about 280°C.
  • the steel wire is treated by various steps of the process as follows:
  • inventive cable 1 has a diameter of about 15.4 mm and 1+6 configuration.
  • the central wire or king wire has a diameter of about 5.4 mm and each outer wire has a diameter of about 5.0 mm.
  • inventive cable 2 has a diameter of about 17.8 mm and 1+6 configuration.
  • the central wire or king wire has a diameter of about 6.10 mm and each outer wire has a diameter of about 5.85 mm.
  • FIG. 2 The cross-section of a multi-strand cable 20 having 1+6 configuration is shown in Fig. 2 .
  • the six outer steel wires 22 are twisted around the central wire 24.
  • Fig. 3 shows a partial sectional view in side elevation of a cable bolt in an example. As shown in Fig. 3 , the first end of multi-strand cable 31 is inserted in a borehole 32 and the second end 33 is attached with a fixture 34 secured to the end of the multi-strand cable for tensioning the multi-strand cable relative to the rock mass.
  • the fixture 34 of the cable bolt may comprise a wedge portion (not shown in Fig.
  • the cable bolt may further comprise a plate 35 placed between the rock mass and the fixture 34.
  • the plate 35 has an opening for the passage of the multi-strand cable through the plate.
  • the first end of cable contacts the bonding agent cartridge 36, such as an uncured resin enclosed in a bag and separated from a catalyst which is provided in the inner part of the borehole. This causes the bonding agent to flow around and along the length of the multi-strand cable 31 to secure the multi-strand cable 31 within the borehole by e.g. cured resin 37.
  • the bonding agent cartridge 36 such as an uncured resin enclosed in a bag and separated from a catalyst which is provided in the inner part of the borehole.
  • the properties i.e. the diameter (Dia.), the mass, the maximum possible length which can be installed in a borehole of a mine, the maximum load or load capacity, the deformation at fracture or deformation capacity, and the energy absorption of the multi-strand cable bolt according to the present invention are compared with the properties of standard cable bolt and commercially available D-blots and rebars in Table 1.
  • Table 1 Comparation of the properties of rock bolts Dia. (mm) Mass (kg/m) Max.
  • Rebar also known as reinforcing steel
  • Rebar is a steel bar used as a tension device to strengthen and hold the rock mass or concrete in tension. Rebar's surface is often patterned to form a better bond with the grout or concrete.
  • D-Bolt is a smooth steel bar with a number of anchors along its length. It is anchored in a borehole with either resin or cement grout. The D-Bolt is only fixed with the grout in the anchors' positions, while the smooth sections between the anchors can freely deform when subjected to rock dilation.
  • D-bolts and rebars are commonly used for underground supporting. As shown in table 1, the cable bolts generally have lighter mass than the D-bolts and rebars.
  • the flexibility of cable bolts is much better than D-bolts and rebars.
  • the cable bolts can be installed with a preselected length of more than 8 m, while the D-bolts and rebars typically have a preselected length of less than 3 m and 6 m respectively due to their limited flexibility.
  • the cable bolts can withstand a relatively high load i.e. 20 tons and even more.
  • the deformation at fracture of the D-bolts and rebars is about two times of that of the standard cable bolt.
  • the inventive cable bolt 1 has a same diameter (15.4 mm) and configuration as the standard cable bolt except the composition and thermal treatment of steel wires are different.
  • the maximum load which the inventive cable bolt 1 can suffer is slightly lower than the standard cable bolt (20 tons vs. 27 tons).
  • the deformation at fracture of the inventive cable bolt 1 is about 15.5 cm/m, which is more than double the value of the standard cable bolt (7 cm/m in table 1).
  • the energy absorption of the inventive cable bolt 1 is thus significantly higher than that of the standard cable bolt (28 KJ/m vs. 15.5 KJ/m).
  • the load capacity is the same as the standard cable bolt (27 tons) while the deformation at fracture is more than two times of the load capacity of standard cable bolt (15 cm/m vs. 7 cm/m).
  • the energy absorption of the inventive cable bolt 2 is about 37 KJ/m, which is significantly higher than the energy absorption of standard cable bolt and even higher than the studied D-bolts and rebars.
  • the inventive cable bolts are attractive means for supporting mining operations in particular for areas prone to burst because the inventive cable bolt has less in materials and mass, has more in flexibility and ductility, and importantly has higher energy absorption.
  • a plurality of polymer sleeves 42 are applied at selected positions along the length of the multi-strand cable 41.
  • the plurality of polymer sleeves 42 may be applied by cladding.
  • the sleeves are intended to protect the covered portions of the multi-strand cable from grout.
  • the anchored portions which are not covered by sleeves, make the bolt anchored to the rock mass. In this configuration, the failure at one portion does not affect the other portions.
  • Each portion works independently, only a fraction of the load transferred to the cable bolt plate. This type of cable bolt is strong, tough, reliable and easy to install with standard equipment.
EP15177973.3A 2015-07-23 2015-07-23 Kabelbolzen Withdrawn EP3121369A1 (de)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP15177973.3A EP3121369A1 (de) 2015-07-23 2015-07-23 Kabelbolzen
EP16739129.1A EP3325769A1 (de) 2015-07-23 2016-07-14 Kabelverankerungen
CA2989263A CA2989263A1 (en) 2015-07-23 2016-07-14 Cable bolts
CN201680041823.6A CN107849918A (zh) 2015-07-23 2016-07-14 缆绳螺栓
PE2017002726A PE20180638A1 (es) 2015-07-23 2016-07-14 Pernos de cable
PCT/EP2016/066817 WO2017012994A1 (en) 2015-07-23 2016-07-14 Cable bolts
AU2016294836A AU2016294836A1 (en) 2015-07-23 2016-07-14 Cable bolts
US15/744,392 US20180245468A1 (en) 2015-07-23 2016-07-14 Cable bolts
CL2017003380A CL2017003380A1 (es) 2015-07-23 2017-12-26 Pernos de cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15177973.3A EP3121369A1 (de) 2015-07-23 2015-07-23 Kabelbolzen

Publications (1)

Publication Number Publication Date
EP3121369A1 true EP3121369A1 (de) 2017-01-25

Family

ID=53761212

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15177973.3A Withdrawn EP3121369A1 (de) 2015-07-23 2015-07-23 Kabelbolzen
EP16739129.1A Withdrawn EP3325769A1 (de) 2015-07-23 2016-07-14 Kabelverankerungen

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP16739129.1A Withdrawn EP3325769A1 (de) 2015-07-23 2016-07-14 Kabelverankerungen

Country Status (8)

Country Link
US (1) US20180245468A1 (de)
EP (2) EP3121369A1 (de)
CN (1) CN107849918A (de)
AU (1) AU2016294836A1 (de)
CA (1) CA2989263A1 (de)
CL (1) CL2017003380A1 (de)
PE (1) PE20180638A1 (de)
WO (1) WO2017012994A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2018332208B2 (en) * 2017-09-15 2021-10-21 Rand York Castings (Pty) Limited A rock bolt
CN117377812A (zh) * 2021-03-23 2024-01-09 Cmte发展有限公司 碳纤维岩石锚杆

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2107826A1 (en) * 1993-01-28 1994-07-29 Harvey D. Gillespie Mine Roof Bolt
US5586839A (en) * 1994-09-06 1996-12-24 Gillespie; Harvey D. Yieldable cable bolt
US20110299940A1 (en) * 2010-06-08 2011-12-08 Earl Jr James L Resin-anchored bolt with indentations
WO2013041541A1 (en) * 2011-09-20 2013-03-28 Nv Bekaert Sa Quenched and partitioned high-carbon steel wire
US20150043976A1 (en) * 2012-03-09 2015-02-12 Nv Bekaert Sa Strand, cable bolt and its installation

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
GB2281366B (en) * 1993-08-16 1996-07-31 Bridon Plc Ribbed flexible member for casting into an anchorage medium
GB9403675D0 (en) * 1994-02-25 1994-04-13 Asw Ltd High tensile strand anchorages and methods of installation thereof
CN200971786Y (zh) * 2006-09-01 2007-11-07 济南澳科矿山工程技术有限公司 矿用锚索
CN102704971B (zh) * 2012-01-11 2016-03-02 济南澳科矿山工程技术有限公司 孔内止浆注浆锚索
CN102937028A (zh) * 2012-11-23 2013-02-20 天地科技股份有限公司 一种煤矿巷道底板加固方法及对中装置
CN204267065U (zh) * 2014-11-13 2015-04-15 中国矿业大学 一种软岩巷道底板高预紧大直径套管锚索结构

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2107826A1 (en) * 1993-01-28 1994-07-29 Harvey D. Gillespie Mine Roof Bolt
US5586839A (en) * 1994-09-06 1996-12-24 Gillespie; Harvey D. Yieldable cable bolt
US20110299940A1 (en) * 2010-06-08 2011-12-08 Earl Jr James L Resin-anchored bolt with indentations
WO2013041541A1 (en) * 2011-09-20 2013-03-28 Nv Bekaert Sa Quenched and partitioned high-carbon steel wire
US20150043976A1 (en) * 2012-03-09 2015-02-12 Nv Bekaert Sa Strand, cable bolt and its installation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"SDS Square Head Cable Bolt Special Deformed Strand", 1 September 2011 (2011-09-01), Internet, pages 1 - 4, XP055252962, Retrieved from the Internet <URL:http://www.minovausa.com/pdfs/Products/SDS%20Sqr%20Head%20Cable%20Bolt%20-%20FINAL%20-%2007Sept2011.pdf> [retrieved on 20160224] *

Also Published As

Publication number Publication date
EP3325769A1 (de) 2018-05-30
CL2017003380A1 (es) 2018-05-11
CN107849918A (zh) 2018-03-27
CA2989263A1 (en) 2017-01-26
PE20180638A1 (es) 2018-04-16
WO2017012994A1 (en) 2017-01-26
AU2016294836A1 (en) 2017-12-21
US20180245468A1 (en) 2018-08-30

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